ASTM A-106/A-106M- Material inspection and review MTC – Carbon steel pipe

Order information

  • Quantity (feet, metres, or number of lengths),
  • Name of material (seamless carbon steel pipe, Please note that ASTM A106 does not cover the welded pipe),
  • Grade,
  • Manufacture (hot-finished or cold-drawn),
  • Size (NPS [DN] and weight class or schedule number, or both; outside diameter and nominal wall thickness; or inside diameter and nominal wall thickness),
  • Special outside diameter tolerance pipe,
  • Inside diameter tolerance pipe, over 10 in. [250 mm] ID,
  • Length,
  • Optional requirements,
  • Test report required (Section on Certification of Specification A 530/A 530M),
  • Specification designation (A 106 or A 106M, including year-date),
  • End use of material (bevel or plain end),
  • Hydrostatic test or NDE test,
  • Special requirements.

Pipe inspection and review its MTC meet type 3.1 are a minimum of Manufacturer, Heat number, Specification and its grades, Manufacture/ Delivery condition, Dimensions, Weight, Mechanical properties, Chemical analysis, Hydrotest or non-destructive test, supplementary (if specified in the purchase order).

Questions about product marking?

Location and marking information?

At last one location, and marking shall begin approximately 12 in. [300 mm] from the end of each length of pipe

How to accept an actual marking?

Refer to below mentioned of "product marking" requirement.

Why we caped/protected the end of pipe by plastic covers?

To protect internal pipe, collect water and moisture.

Manufacture

A mill or process manufacturer must correctly state in the MTC including company, work site and additional review must be included the approval’s vendor list (if any).
Product markings: company’s name or company’s logo are required, like "NSSMC" in cover photo.

Trace number

Also called heat number, ladder number (L), cast number declared in the MTC. The trace number is traceability to all the test results such as chemical analysis results, mechanical test results, NDE test results, etc. The marking code also accept in the MTC by process manufacturer which they assigned another making code under company quality manual control.

Product markings: heat number or cast number are required.

Specifications and grades

A material specification, in the MTC should have year of edition.

Product markings: specifications number and material grade. (multi-grades may be marked on the same product).

Manufacture/ process

Manufacture method to size. The steel shall be killed steel, with the primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining.

Example, hot finish or cold finish, seamless or welded.

Product marking: SMLS.

Please note that ASTM A106 does not cover the welded pipe.

Dimensions

Including of diameter, thickness as given in ASME B36.10M

Tolerance of wall thickness measurement shall not less than 15% of nominal thickness and not exceed 20% or nominal wall thickness.

Product markings: NPS 8” Sch40.

Weight

Mass per unit length, pipe larger than NPS 4” shall include the weight and weight class. The mass of any length of pipe shall not vary more than 10% over and 3.5% under that specified.

Product marking is required for pipe larger than NPS 4”.

Mechanical properties

Tensile strength, yield strength and percentage of elongation. Width of the gage length, when longitudinal strip tension test specimens are used.

Additional test should be verified:

Bend test is required for pipe NPS 2 [DN 50] and under; acceptable,

Flattening test is required for pipe NPS 2 [DN 50] and under; acceptable,

Product marking is not required.

Chemical analysis

Heat analysis and/or product analysis. Some MTC stated heat analysis (H) and/or product analysis (P). Tolerance refer to ASTM A530.

  1. Heat analysis (H): an analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elements.
  2. Product analysis (P): At the request of the purchaser, analyses of two pipes from each lot shall be made by the manufacturer from the finished pipe.

Product marking is not required.

Heat treatment

Hot-finished pipe need not be heat treated. Cold-drawn pipe shall be heat treated after the final cold draw pass at a temperature of 1200°F (650°C) or higher

Product marking is not required

Hydrotest or Non-destructive electric test

Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test.

Hydrostatic test:

Each length of pipe shall be tested not less that 60% of the minimum specified yield strength for carbon and ferritic alloy steel pipe, or 50% of the specified minimum yield strength for austenitic alloy steel pipe.

Equation: P = 2St/D or S = PD/2t,

where:

P = hydrostatic test pressure (psi or MPa),

S = pipe wall stress (refer to ASME II Part B),

t = wall thickness, nominal wall, D = outside diameter.

Non-destructive electric test:

As an alternative to the hydrostatic test at the option of the manufacturer.

>>> Product marking: hydrotest valve or NDE, both.

Supplementary

As specified in the purchase order as NACE MR0175, upgrade or re-test material

Stated and certified by mill signature

Manufacturer statement and endorsed by Quality department.

Nguyen Duy Bien
 

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